before noon, but went down again since 1/8 rain, wind and cloud portended no opportunity for field work on the mountains. There being less mist in the air on the 15th, James and I started for the rim in the rain at 9:30 in the morning. Per- the weather began to clear by noon deviance was rewarded, and in the latter part of the afternoon condi- tions for theodolite work were almost ideal. The fine weather continued through the next three days and enabled me to do all the impor- tant work for which I had planned, except the making of the topographic sheet. The surface of the caldera was determined as being 779 feet below the rim of the crater where the leeward trail arrives, and 1386 feet below the highest point of the rim, which is on the northern side.